"Everything I have been doing for the past 13 years has been in some way connected with this trip. And tomorrow there will be no more."

The Army officer's son from Askers-well, Dorset, crossed five continents and two oceans using his pedal boat, kayaks, inline skates and bicycles.

He was confronted by robbers, arrested by Egyptian authorities who thought he was a spy, he was forced to flee pirates and he braved crocodiles – not to mention having both legs broken when he was hit by a car driven by an 82-year-old while inline skating across America.

Jason landed his 26ft pedal boat Moksha at a jetty at the Royal Naval College at 10.51am.

Then he and his team loaded it on to a trailer and pushed the hand-built wooden craft through Greenwich Park to cross the Meridian. His final leg at sea was a three-day trip across the English Channel, where French authorities threatened to arrest him for breaching their maritime regulations which ban pleasure craft venturing more than 350 metres out into territorial waters.

Eventually locals in Calais helped push him out beyond the surf from an isolated beach to avoid detection.

Jason said of the incredible adventure: 'There have been many high moments. It's always good to reach the other side of an ocean.

"To be honest, if it was just about the physical challenge I would have got bored. The “why” question changed over the years. I started circumnavigating the world but it became more about using the

expedition as an educational tool."

The adventurer now plans to organise mini-expeditions for young people and give talks about climate change.

He went on: 'I met tremendous people in every culture. Under the veneer of official abuse there are good people everywhere living their lives."

Jason fulfilled the rules of a true circumnavigation by starting and finishing at the same point, reaching two places diametrically opposite each other on the globe, crossing the equator and crossing all longitudes. His GPS equipment logged the total distance of 46,505 miles – more than the direct routes of each leg.

He began the trip with university friend Steve Smith, who later pulled out. The pair set the world record for the first east-west crossing of the Atlantic by a pedal-powered boat.

Jason made the first solo crossing of the US on inline skates and the first pedal-powered crossing of the Pacific Ocean, which took 178 days. His funding came from sponsors and odd jobs, including driving cattle in Colorado.